Country mail svc

• Service where there isn't a nearby P.O
• Farmer's mailing add
• TV oldie "Mayberry ___"
• Old postal letters
• Address abbr
• Old letters in the mail
• Farm mail abbr
• Mail svc. that may cover a general store
• Country mailing addr.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also R.F.D. ; 1882, American English, it stands for rural free delivery .